TPS92551_16 Datasheet, PDF (1/26 Pages) Texas Instruments – 450mA 23W Constant Current Buck LED Driver Micro-Module

TPS92551, TPS92551EVM
www.ti.com
SNVS805C – MAY 2012 – REVISED MAY 2013
450mA 23W Constant Current Buck LED Driver Micro-Module
Check for Samples: TPS92551, TPS92551EVM
FEATURES
1
•2 Integrated All Power Components Including
the Power Inductor
• Wide Input Voltage Range : 4.5V - 60V
• Constant Switching Frequency at 800kHz
• High Contrast Ratio (Minimum Dimming
Current Pulse width < 16µs)
• Drives up to 16 LEDs in series at 60V input
• ±3.5% Typical LED Current Accuracy
• LED Current Adjustable from 300mA to 450mA
• Up to 95% Efficiency
• TPS92551 Modules can be Connected in
Parallel for Higher Current Operation
• Input Under-Voltage Lock-Out (UVLO)
• Compatible with Ceramic and Low ESR
Capacitors
• Low Electro Magnetic Interference (EMI)
Complies with EN55015 Standard ⁽¹⁾
• LED Open and Short Circuit Protections
• Thermal Shutdown and RoHS Compliant
• -40˚C to +125˚C Junction Temperature Range
DESCRIPTION
The TPS92551 Constant Current Buck LED Driver
Micro-Module drives maximum 450mA LED current
up to 16 LEDs in a single string (maximum 23W). It
integrates all the power components including the
power inductor. The TPS92551 provides a full turn-
key, highly efficient solution for wide range of single
string LED lighting applications with up to 95% power
efficiency. It accepts an input voltage ranging from
4.5V to 60V and delivers a 350mA LED current as
default. The LED current is adjustable from 300mA to
450mA by charging a single external resistor.
The module operates at constant switching frequency
(800kHz) with low Electro Magnetic Interference(EMI)
complying with EN55015 standard. The module has
fast control loop to realize fine LED current pulse
yielding 256–step PWM dimming resolution at 240Hz
for general lighting. Protection features include
thermal shutdown, input under-voltage lockout, LED
open-circuit and short-circuit protections. The
TPS92551 Micro-Module is available in 7-pin PFM
power package.
APPLICATIONS
• General Lighting, Desk Lamps
– Cabinet Lamps
– Decorative Lamps
– Street Lamps
• Architecture Lighting, Recess Lights
– Spot Lights
– Underwater Lights
PACKAGE HIGHLIGHTS
• 7-Lead Easy-to-Use Package (Similar to TO-
263)
• Single Exposed Die Attach Pad for Enhanced
Thermal Performance
• 10.2 x 13.8 x 4.6 mm Package
(1) EN55015, refer to Figure 35 and Figure 36
(1) θ _JA measured on a 1.705” x 3.0” four layer
board, with one ounce copper , thirty five
12 mil thermal vias, no air flow, and 1W
power dissipation.
Figure 1. 7-Pin PFM Package
10.16 x 13.77 x 4.57 mm (0.4 x 0.39 x 0.18 in)
θ_JA = 20°C/W, θ_JC = 1.9°C/W⁽¹⁾
RoHS Compliant
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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